42 



aenceof revolving lines ; from C. tenuicula, in 

 the number of whorls, in the greater numl 



in his specimen', and in the shouldered char- 

 acter of the last whorl. My description is found- 

 ed on an examination of thirty shells, ami I am 

 unable to identify this fossil with any described 

 species. The well marked characteristics 

 ol" the fossil, arising from the revolving lines 

 sing iln' folds, giving them the appearance of 

 small papillae upon their convex surfaces, were 

 considered sufficiently suggestive of the specific 

 name applied. 



TORN VTELLA HLI.IPTICA — TRASK. 



mall; acutely elliptical ; substance "1' 



shell rather firm; si\ Bubspiral shouldered whorls ; 

 twelve slightly oblique folds on the three last 

 whorls, which terminate aboul hall' way down 

 on the body whorl : the three middle whorls en- 

 circled by four cordate lines each; the last whorl 

 has fourteen lit acute : last whorl about 



three-fifths the length of the shell. 



elliptical : half the length of the 

 shell ; outer lip subcrenate from the termination 

 of the cordate lines on the last whorl : a minute 

 reflection of the inner lip passes around the pos- 

 terior edge <>\' the aperture, and becom 

 on tin- edge of the aperture. 



Length, live-twentieths of an inch; breadth, 

 -tenth of an inch. From Santa Barbara. 

 Two Specimens only of this shell were found at 

 this locality, and though an inhabitant ol lower 

 latitudi 3, yel we find it fossil with M 

 among the marine deposites of our hills, ass 

 ed in tin- sain - beds which contain the northern 

 types. 



Ml RKX FRAGH.I3.— TrASK. 



7 thin ; small : six deeply shouldered 

 sub-oblique flattened whorls: last whorl tra- 



• rather small fringed vai 

 periphery of the body whorl is surmounted by a 

 small rounded -pine on each varix, and 

 obliquely outward upon tin- edge of the shoul- 

 der; the last whorl is traversed by thirteen un- 

 equal tranverse ribs ; tip- three middle whorls 

 have dy lour and three of the trans- 



central one of which i- usually 

 the most prominent : indistinct fold- on the 

 middle whorN- formed from the varices on the 

 la-t whorl : anterior portion of the canal i I 



lip thin. The aperture of this specimen lit being 

 tin- only one loitud that was near entire.) v. 

 badly broken, it is impossible to make out its 

 form with accuracy. It is very difficult to ob- 

 tain a specimen entire, although fragments of the 

 ■ 



I. ngth, four-tenths of an inch ; breadth, thiec- 

 i«-iii :*— . Fron - in. 



I r. i -k. 



ui : rather thin ; about si mii 



x whorle ; turretod ; the last whorls have 



about twelve row* , beotete 



near the middle of the last whorl ; eight or nine 



wavy transverse threads traverse the lower whorl, 



ling less defined from the middle forward ; 



folds interrupted at the sutures ; apex subacute. 



Aperture semicircular : canal, slightly ob- 

 lique ; external lip rather sharp, and thin ; indis- 

 tinct stria.' within, columella smooth. 



Length, nine-tenths of an inch ; breadth, four- 

 tcuths. From Santa Barbara. 



In sculpture this fossil approaches F, Missisip- 

 pieusis of Conrad, but is very much smaller, and 

 differs also in the number of folds and the many 

 forms of the transverse thread-. It is not plen- 

 tiful at the locality where it was found : three 

 lens only were met with, and the above 

 iption is from the largest shell. 



Fusos ROBUSTos. — Trask, 



S U fusiform, turreted, thick ; about .-even 

 convex whorls: eight varicosed, distant folds on 

 the last whorls, which are interrupted at the 

 suture- : abmt five revolving lines on the upper 

 whorls, and twelve on the last : folds become ob- 

 solete a little anterior to the middle of the body 

 whorl : greatest breadth across the posterior por- 

 tion ol the aperture. 



' be; outer lip thick : canal 



straight : distance from the posterior edge of the 

 aperture to the end of tin.' canal, equal to half 

 the length of the shell ; apex ol' the spire blnnlly 

 round 



LunjJ inch and tWO-teuths ; breadth. 



five-tenths. From San Pedro. 



aid at heights varying from eighty to one 

 hundred i the sea, 



Fcsus rogosus.— Tn ■■ 

 Sliell fusiform, somewhat thin, turreted; 

 spire acute : eight convex whorls : two first with- 

 out folds; nine distant folds on the lasl whorl, 

 becom ete on a. line parallel with the pos- 



terior edge of the aperture; two last whorls 

 traversed by small longitudinal wrinkles; about 

 fourteen cli roiewhal squared, lines on the 



last whorl, with intermediate smaller line 

 tween, which are continuous to the base of the 

 shell. 



tun semicircular; canal oblique, and 

 somewhat elongated ; from the posterior edge of 



lerture to the anterior end of the canal, is 

 little more than half tin' length ol the shell ; outer 

 lip thin : columella smooth. 



Length, one inch and four-tenths ; breadth, six- 

 tenths. From San Pedro. 



In sculpture, this .-hell resembles somewhat F. 

 ambustusol Uould; the fossil differs from that 

 shell in the more abrupt and rounder termina- 

 tion of the upper part of the whorls at the su- 

 tures, and in its presenting no furrow- within the. 

 aperture. The upper whorls of the latter also 

 ic somewhat flattened, while in the former 

 tiny appi ar to preserve much uniformity in their 



form throughout It has the appearance ol be- 

 [April 



